Spent a few happy hours moving forward with the engine. Firstly I needed to wire brush the main casting so I could prime it. I have thought about shot blasting but concluded it would not add a lot. I raised the casting up a bit higher and used a rotary wire brush in my 4" angle grinder. The engine plates had to be drilled off and will go back with new rivets after the painting (note to self - put them on before the flywheels go on).
I have been unsure how to remove the stuck exhaust valve and removable guide from the cylinder head but concluded that heating it in a bonfire might be best. I also have two big end bolts stuck in the bearing cap which I thought might respond to the same treatment. I built a small hardwood bonfire and after it was going put the cylinder head on top. I added more wood round the outside and left it to get hot. I also put the bearing cap in too. After about one hour and half and the fire was dying down I knocked the exhaust valve in a little and loosened the guide. I also knocked the bolts on the big end cap and they both moved. I then left the whole lot to cool down for a few hours.
Back on the bench with some WD40 etc I disassembled the bits. I was careful to file down the valve stem where it had slightly mushroomed before driving it through its' guide.
You will note that I have now found a crack in the cylinder head (see photos). I was very worried that I had done this on the bonfire, but looking at its position at the bottom of the head and being part of the water jacket I am concluding that this is frost damage from long ago. Looking at earlier pictures I have taken of the cylinder head, the crack was not obvious. May be the bonfire opened it up. Another job to research!
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| Preparing to wire brush the main casting |
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| Removing the badges by carefully drilling the rivets, starting with a small drill bit and working up. |
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| The stuck exhaust valve (top left). |
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| The valve and valve guide removed after firing |
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| The separated big end cap from its bolts. Wondering whether the bolts should be reused or new ones made? |
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| The casting crack at the low point of the water jacket. |
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